At 1:56, whats the thing going around the bolts on the kofi? Looks like some sort of band or wire?

EDIT: good catch! That’s one of the recent updates to my Kofi design; it’s a very tight fitting industrial rubber band to keep the nuts from being able to come loose (basically a poor man’s cotter pin). I used to just tape them but this works more elegantly. I could drill them and use a pin, or use locknuts (or lock washer), but all of those seem too extreme.